Here is the full list of all 15 Xanadu Next achievements.
Barely made it back to shore after almost drowning.
Found and translated all tabulae and memoirs.
Innately learned all skills and acquired all levels of all spells.
Found and maxed out all Guardians.
Mapped 100% of the game.
Reached max rank.
Defeated Berilard.
Defeated Dvorak.
Defeated Scoltula.
Defeated Evilwurm.
Defeated Ascomoid.
Defeated Lorelei.
Defeated Galsis.
Conquered another dimension.
Attained all other achievements.